/*
 * 版权所有 (C) 2015 知启蒙(ZHIQIM) 保留所有权利。[遇见知启蒙，邂逅框架梦，本文采用木兰宽松许可证第2版]
 * 
 * https://zhiqim.org/project/zhiqim_kit/zhiqim_git.htm
 *
 * ZhiqimGit is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
package org.zhiqim.git.objer.loader;

import java.io.IOException;

import org.zhiqim.git.GitI18n;
import org.zhiqim.git.objer.PackFile;
import org.zhiqim.git.objer.objectid.ObjectId;

import org.zhiqim.kernel.util.Asserts;

/**
 * 增量引用包加载器
 *
 * @version v1.0.0 @author zouzhigang 2017-3-30 新建与整理
 */
public class DeltaRefPackedObjectLoader extends DeltaPackedObjectLoader
{
    private final ObjectId deltaBase;

    public DeltaRefPackedObjectLoader(final PackFile pr, final long dataOffset, final long objectOffset, final int deltaSz, final ObjectId base) throws IOException
    {
        super(pr, dataOffset, objectOffset, deltaSz);
        this.deltaBase = base;
        super.load();
    }

    protected PackedObjectLoader getBaseLoader() throws IOException
    {
        PackedObjectLoader ldr = pack.get(deltaBase);
        Asserts.assertNotNull(ldr, GitI18n.objectNotFound, deltaBase);
        
        return ldr;
    }

    @Override
    public int getRawType()
    {
        return OBJ_REF_DELTA;
    }
}
